Rotation device



' Aug. 24 1926. v1,597,192

C. C. HANSEN Ro'rATIoN DEVICE Filed Jan. 13', 192e /f if" y 2.1

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Patented Aug. 24, 1926.

UNITED STATES 1,597,192 lPATENT OFFICE.

CHARLES C. HANSEN, GF EASTON,

PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, `OIE JERSEY CITY, NEW JERSEY, A CORPORATION 0F NEW JERSEY.

ROTATION DEVICE.

Application led January This invention relates to rock more particularly fluid tyre. Y l

An object of the present invention is to drills` but to a ,rotation device for actuated rock drills ofthe hammer Y rotate the drillsteel hy means of a gear motor constantly exposed to pressure fluid and connectedto transmit rotary movement to the steel through the rifle har, the piston and the associated chuck parts.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the 'combinan tions of elements and arrangement of parts substantially as hereinafter described and more particularly pointed Yout in the appended claims and illustrated in the a companying drawings, in which- Figure l is an elevation partly in section of a rock drill equipped with a rotation device constructed in accordance with the practice of the invention,

Figure 2 is a transversesection taken through Figure l on the line 2-2 "looking r in the direction of the arrows, and

Figure 3 is an elevation in section of the motor taken through Figure 2 on the line 3--3 looking in the direction of the arrows.

Referring to the drawings, the invention is shown embodied in a rock drill in which a cylinder A, a front head B, a `back head C and a back cylinder extension D comprise the casing of the rock drill and are held in operative position with respect to each other by side bolts E arranged on `opposite sides of the drill. The cylinder A in this instance has a free exhaust port F and is provided with a reciprocatory piston G having a fluted forward extension or nose H. The nose H is guided by a front cylinder bush* ing J and interlocks slidably with a chuck nut K disposed rotatably in the front end of the cylinder A.

In order to prevent relative rotation between the chuck nut K and an anvil block seat L rotatable in theV rearward end of the front head B, cooperating clutch members O and P are formed on the chuck nut and the anvil block seat respectively. In like manner, the front end of the anvilblock seat L is provided with clutch members Q which interlock with similar clutch members R carried by a chuck S which is bored to receive a drill steel U. Disposed within the anvil block seat L and adapted to re- 13, 1926. SerialNo. 80,942.

ciprocate into the rearward end of the chuck S is an anvil block V for transmitting the blows of the hammer piston Gr to the drill steel U.

Secured to the cylinder A is a valve chest lV carrying a connection X through which pressure fluid may be conveyed for operating the drill. The pressure fluid admitted into the valve chest IV is in this `instance distributed to the ends of the cylinder A by a flat oscillatory valve Y adapted to control the inlet ports Z and In accordance with the present invention, the back cylinder extension D projects into the cylinder at c and forms a closure for the rearward end of the cylinder and is also provided with rearwardly extending' wall d which forms a seat for the back head C. The back head C projects slightly within the wall d and thus forms a closure for one end of the chamber e formed within the back cylinder extension.

In order to impart rotary movement to the drill steel U for keeping said drill steel free within the drill hole, a rifle or rotation bar extends through the back cylinder eX- tension D and is provided with spiralled flutes g which engage the piston G in the usual manner. rl`he rifie bar f in this insta-nce is provided with a worm gear 7L near its rearward end and is arranged to rotate within the chamber e.

Suitable means are provided for constantly rotating the rifle bar f during the reciprocation of the piston G. To this end a motor casing j is preferably formed integrally with the back cylinder extension and is provided with a pair of intermeshing gears k and 0 constituting a rotary motor. In this instance the gear 7c is provided with an integral shaft p supported at one end in the back cylinder extension D and at its other end in a cover g which forms a closure for a motor chamber r within which the gears 7c and 0 are housed. Similarly, the gear 0 is provided with a shaft s which may be formed integrally with said gear as indicated, or may be formed separately and secured thereto in any convenient and well vknown manner. The shaft s, like the shaft p, is also supported at one end in the cover g and at its other end is supported by the back cylinder extension D and carries near its inner end a worm t which meshes with. the 'worm Wheel. 7a ,ihe

worm drive so formed is intended to be of the usual non-reversible type, which can only be rotated in one direction. By this is meant a worm drive which becomes locked and cannot be rotated reversely or backwardly by power applied to the driven member, which in this case is the worm gear z. l

To the end that a. constant supply of pressure fluid may be supplied to vthe chamber r, a passage u is fomed through the back cylinder extension D and through the va'lve` chest W to be in constant communication lat one end with the inlet connection X. Any suitable means may be provided for controlling the supply ot pressure fluid to the chamber 1", but the control of suoli pressure fluid supply to the motor may be effected by the means which control the supply of pressure fluid to Jthe cylinder A, as for instance, a throttle valve (not shown) preferably of a well known type commonly used for such purposes.

In the operation ofthe device let it be assumed that pressure fluid is being admitted into the valve chest W for actuating the hammer piston G. A portion of' the pressure fluid thus admitted to the valve chest will pass through the passage u and acting against the gears ykando will rotate the rifle bai' f. Such rotation oit the rifle .bar is in turn transmitted through 'the pist-on G and through the interlocking chuck ,parts to the drill steel U, thus constantly changing the position of the drill steel with respect Ito the rock .face for each successive blow ot' the hammer piston. As hereinbefoi'e described the rifle bar, together with the interlocking associated parts, will be constantly rotated and rotation ofthe drill steel will be cliec redV only momentarily at the instant `theblow yof the hammer piston is delivered thereon. lt, however, undue resistance should occurbetween the d rillsteel and the-rock, ,and Vsuch resistance should tbe sufficient to temporarily check rotation ofthe inotor, the pressure Vfluid admitted in the front end of the cylinA der will, during the rearward stroke ofthe piston, cause said piston to describe a partial revolution .on A.the rifle ybar :due vto the spiral flutes g and thus change :the position rotation of' the drill'steel will be at all times assured. The parts comprising the rotation mechanism may be-or" simple and sturdy construction, and breakage which so frequently occurs iinvinechanisms for rotating the .drill stcelwill be entirely eliminated.

I ciaim:-

l. ln a Vrotation device for rotating VtheV drill steel of-a fiuid actuated rock drill, the combination of a cylinder and reciprocating piston, a rotation vbar having spiral fiutes interlocking slidably with the piston, a rotation motor, and a worm drive comprising driving and driven members incapable ot being rotated in rev rse directionby power applied to the driven member and operatively connected between tlie motor and the rotation bar, whereby increased resistance to rotation ot the drillsteel beyond a predetermined amount suficient to stop the motor will permit relative rotation between the piston and the rotation'bar to continue and thus aid in releasing the drill steel in the drilled hole.

2. in Va rotation device for rotating theV drill steel of a iiuid actuated rock-drill, the

ycombine-tion of' a cylinder and reciprocating piston, a rotation bar having spiral flutes interlocking slidably with the piston, a rotation motor, a worin gear on the rotation bar, and a worm connected to the motor, said worm drive so constituted being` incapable ot being rotated backwardly by power vapplied to the worm gear, whereby the rotationlbar and piston areiiormally constantly rotated in unison but upon increased `resistance to rotation of the drill steel beyond a predetermined amount sufficient to stop the motor,

relative rotation will continue between fthe piston'and the rotation bar V.to aid in releasing the drill steel in the drilledlhole.

In testimony whereof l Ahaveesigned `this specication. Y

- CHARLES C. HANSEN. 

